SYNOPSIS

DESCRIPTION

These functions provide software encryption support for 802.11 device
drivers.
The ieee80211_crypto_attach() function initializes crypto support for the
interface ifp, and sets the initialization vector (IV) for WEP encryption
to a random number derived from a secure PRNG.
The ieee80211_crypto_detach() function frees data structures associated
with crypto support for the interface ifp.
The ieee80211_wep_crypt() function runs the appropriate WEP encryption
algorithm over the 802.11 encapsulated frame held in the mbuf chain m0,
for transmission or reception on the interface ifp. The txflag argument
specifies whether the frame is being received or transmitted. A value of
0 indicates that the frame is being received and should therefore be
decrypted; a non-zero value indicates that the frame is being transmitted
and should be encrypted.

IMPLEMENTATIONNOTES

The ieee80211_wep_crypt() function stores its IV in the interface’s
embedded structieee80211com instance.